If nothing else, I think that it should at least be safer than remaining on the ground. [Kaoru isn't exactly sure about having an easier time seeing - not that it's necessary, anyway, when seeing in the dark is very much a Thing that can be done fairly well. Still, there are definitely fewer people on the rooftops than on the ground.

Once they get to the hanging ladder, Kaoru will give it a testing tug before stepping up onto the first rung.]

Try to distribute your weight evenly so the stairs don't creak.